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Visualizing Single Molecular Complexes In Vivo Using Advanced Fluorescence Microscopy

Visualizing Single Molecular Complexes In Vivo Using Advanced Fluorescence Microscopy

Published on: September 8, 2009

A fluorescent "allosteric scorpionand" complex visualizes a biological recognition event.

Mingfeng Yu¹, Qun Yu, Peter J Rutledge

¹School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia.

Chembiochem : a European Journal of Chemical Biology

|January 11, 2013

Summary

Researchers developed a novel fluorescent reporter to visualize biotin/avidin interactions. This new zinc(II) complex shows a measurable fluorescence decrease upon binding to avidin, enabling new detection methods.

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Visualizing the Conformational Dynamics of Membrane Receptors Using Single-Molecule FRET

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Published on: August 17, 2022

Area of Science:

Chemical Biology
Supramolecular Chemistry
Bioconjugation Chemistry

Background:

The biotin-avidin interaction is a cornerstone of molecular biology and biotechnology.
Developing sensitive and specific reporters for this interaction is crucial for various applications.
Existing methods may face limitations in sensitivity or require complex assay development.

Purpose of the Study:

To design and synthesize a novel fluorescent reporter molecule for visualizing the biotin/avidin binding event.
To investigate the photophysical properties of the reporter and its response to avidin binding.
To establish a new method for detecting and quantifying biotin-avidin interactions.

Main Methods:

Synthesis of an unsymmetrical bis-triazole-scorpionand ligand incorporating a naphthalimide fluorophore and a biotin moiety.
Complexation of the ligand with zinc(II) and copper(II) ions.
Characterization of the zinc(II) complex's fluorescence properties.
Investigation of the fluorescence response upon interaction with avidin at varying ratios.

Main Results:

A novel zinc(II) complex based on a cyclam derivative with a pendant naphthalimide dye was synthesized.
The zinc(II) complex exhibited inherent fluorescence, which was modulated upon binding to avidin.
A significant decrease in fluorescence output was observed upon avidin complexation, even at low complex-to-avidin ratios (up to 4:1).

Conclusions:

The developed fluorescent reporter system effectively visualizes the biotin/avidin interaction.
The fluorescence quenching mechanism is likely due to specific interactions within the avidin binding pocket or changes in the complex's coordination geometry.
This reporter offers a promising tool for sensitive detection and imaging of biotin-avidin binding events.